Recently I updated OpenSSH due to a PCI scan failure. We had OpenSSH 6.6 running on an Ubuntu 14.4.3 server. As of this writing OpenSSH is at 7.0 but has not been packaged for Ubuntu Aptitude yet.
This means I need to do a manual install. It was pretty simple for me since I could use the default configuration. Your mileage may vary.
$ apt-get update
$ aptitude safe-upgrade$ cd ~$ tar -zxvf openssh-7.0p1.tar.gz$ cd openssh-7.0p1$ ./configure$ make$ make install
$ ssh -v localhost